Prior to being cast as Starlight Glimmer, Sheridan had "tried for years" to get a role in the series,[1] having auditioned for all of the main characters.[2] When notified about the role of Starlight by her agent, Sheridan recorded an audition in her hotel room while on layover in Kuala Lumpur.[3]

In interviews, Sheridan has described her voice direction for Starlight Glimmer as having not a trace of her sinister nature come through until the episode's climax.[4][5]

In previous generations of My Little Pony, Sheridan provided the voices of Melody in My Little Pony Tales and various characters in several G3 animated specials, including Cotton Candy and Cheerilee.